It fascinates (and depresses) me that there are people who actually believe Musk's “nobody in the car” and “unsupervised” promises in the last earnings call.
Few believed it would be pulled off, except the most devoted of Tesla fans. However, the point is they did promise unsupervised, which is the biggest milestone in this technology, and they didn't get there. It's like promising a moon landing and delivering a New Shepard suborbital flight. Yes, it's a safety driver. A safety driver is, in spite of the vocabulary, not expected to drive. They supervise and intervene.